/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */
package org.apache.http.examples.client;

import java.io.IOException;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.impl.client.FutureRequestExecutionService;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpRequestFutureTask;

public class ClientWithRequestFuture {
	
	public static void main(String[] args) throws InterruptedException, ExecutionException, TimeoutException, IOException {
		// the simplest way to create a HttpAsyncClientWithFuture
		HttpClient httpclient = HttpClientBuilder.create().setMaxConnPerRoute(5).setMaxConnTotal(5).build();
		ExecutorService execService = Executors.newFixedThreadPool(5);
		FutureRequestExecutionService requestExecService = new FutureRequestExecutionService(httpclient, execService);
		try {
			// Because things are asynchronous, you must provide a ResponseHandler
			ResponseHandler<Boolean> handler = new ResponseHandler<Boolean>() {
				@Override
				public Boolean handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
					// simply return true if the status was OK
					return response.getStatusLine().getStatusCode() == 200;
				}
			};
			
			// Simple request ...
			HttpGet request1 = new HttpGet("http://google.com");
			HttpRequestFutureTask<Boolean> futureTask1 = requestExecService.execute(request1, HttpClientContext.create(), handler);
			Boolean wasItOk1 = futureTask1.get();
			System.out.println("It was ok? " + wasItOk1);
			
			// Cancel a request
			try {
				HttpGet request2 = new HttpGet("http://google.com");
				HttpRequestFutureTask<Boolean> futureTask2 = requestExecService.execute(request2, HttpClientContext.create(), handler);
				futureTask2.cancel(true);
				Boolean wasItOk2 = futureTask2.get();
				System.out.println("It was cancelled so it should never print this: " + wasItOk2);
			} catch (CancellationException e) {
				System.out.println("We cancelled it, so this is expected");
			}
			
			// Request with a timeout
			HttpGet request3 = new HttpGet("http://google.com");
			HttpRequestFutureTask<Boolean> futureTask3 = requestExecService.execute(request3, HttpClientContext.create(), handler);
			Boolean wasItOk3 = futureTask3.get(10, TimeUnit.SECONDS);
			System.out.println("It was ok? " + wasItOk3);
			
			FutureCallback<Boolean> callback = new FutureCallback<Boolean>() {
				@Override
				public void completed(Boolean result) {
					System.out.println("completed with " + result);
				}
				
				@Override
				public void failed(Exception ex) {
					System.out.println("failed with " + ex.getMessage());
				}
				
				@Override
				public void cancelled() {
					System.out.println("cancelled");
				}
			};
			
			// Simple request with a callback
			HttpGet request4 = new HttpGet("http://google.com");
			// using a null HttpContext here since it is optional
			// the callback will be called when the task completes, fails, or is cancelled
			HttpRequestFutureTask<Boolean> futureTask4 = requestExecService.execute(request4, HttpClientContext.create(), handler, callback);
			Boolean wasItOk4 = futureTask4.get(10, TimeUnit.SECONDS);
			System.out.println("It was ok? " + wasItOk4);
		} finally {
			requestExecService.close();
		}
	}
}